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Jyutping bat1 zi1 so2 cou3
Pinyin bù zhī suǒ cuò

Definitions (CC-CEDICT)
  1. not knowing what to do (idiom); at one's wits' end
  2. embarrassed and at a complete loss
Definitions (粵典–words.hk)
  1. 語句
    唔​知​做​咩​好​,​諗​唔​到​任何​對策
    not knowing what to do; to be at a loss; cannot think of any countermeasure
    • 突如其來嘅意外往往令人不知所措。
      突如其来嘅意外往往令人不知所措。
      dat6 jyu4 kei4 loi4 ge3 ji3 ngoi6 wong5 wong5 ling6 jan4 bat1 zi1 so2 cou3.
      An unexpected accident often makes people unable to think of what to do about it.
Definitions (Wiktionary)
  1. phrase, idiomatic
    to be at a loss for what to do; to lose one's bearings
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    我不知所措。
    我不知所措。
    wǒ bù zhī suǒ cuò 。
    • I don't know what to do anymore.
    • I don't know what to do any more.
  2. Mandarin
    他对意料外的结果茫然不知所措。
    他對意料外的結果茫然不知所措。
    tā duì yì liào wài de jiē guǒ máng rán bù zhī suǒ cuò 。
    • He was perplexed at the unexpected result.
  3. Mandarin
    汤姆不知所措。
    湯姆不知所措。
    tāng mǔ bù zhī suǒ cuò 。
    • Tom doesn't know what he should do.
Examples (粵典–words.hk)
  1. Cantonese
    突如其来嘅意外往往令人不知所措。
    突如其來嘅意外往往令人不知所措。
    dat6 jyu4 kei4 loi4 ge3 ji3 ngoi6 wong5 wong5 ling6 jan4 bat1 zi1 so2 cou3.
    • An unexpected accident often makes people unable to think of what to do about it.